Azo-dyestuffs, and process of making same



30 lated and Y means Patented June l1, 1935 I AND rnoonss o u )2 MAKING SAME Hans Schindlieh'n shim tMaEda Fatmaon-the-Main-Fechenheim,"Gerina yfasjsignors t Anplication l 21,

This invention'relates to azo-dyestuffs and tea process of making same. j a t i It is well known that azo-dyestufis derived table fiber (cf.Wahl; Bul. Soc. Chim. 3, vol. 2 9, 1903, page 349). accordance with the presentinyention these 10 pounds) corresponding to the for m ula (wherein X'means theradiealof a coupling com ponent inwhich a hydroxy group .may be alkylated) are converted into valuable direct dyeing cotton dyestuffs-by linking together two mole 1 l t cules thereof byt'a suitable conyelrsiontoftheirni-j 2O tr og enl-containing groupsp L The new tdyestufis r the tn ne siifs tort 4 pe 9 l e e tform l i sour ISOSH wherein X means the radical'of acoupling compon'ent in which a hydroxy group may: be alkya bivalent group containing two n'itrogen atoms, I H This linking maybef effected by partialreductionfoi the nitro-groups with the formation or azoor azoxy-c olmpoundsor bytransforming the nitro-azodyestuiis into'the corresponding aminoample, bythe CO-group or also by condensing the t "The dyestuffs thus obtained may be subjected known for l tioned.

tamed by ki e her 4-"nitr'o-4'faminostilben disulfonic acid itself and'bytetrazotizing the intwo molecules of the disulfonic acid havea very weak aifinity forxvege dyestufis (or the, corresponding diben'zyl com- 13.8 3 tained is separated bythe addition of hydrochloric acid and commonusalt and then filtered "or water andflOZ s H000 01H azo-dyestufis and linking these latter dyestuifs in, the knownmanner by bivalent radicles, fortexmtro azo-dyestuifswith the corresponding aminotro-amiiio-stilbene-disulfonic "or formation of metallic complexes may be mentermediate product thusobtained, for example, a. dinitro-disti1bene urea-tetrasulfonic acid (it nec- ,essary after reduction) and combining it with suitable coupling components. 1 l l 1.: In contradistinction to the starting the present dyestufifs are distinguished by an excellent afiinity for vegetable fiber and in many cases by a remarkable l fastness of the dyeings obtained therewith,

4 In order to" further illustrate our invention the 1 "following" examples are givengthe parts being s by weight and all temperatures in centrigrade degrees;

but it is', howeyerito be understood that ourinvention is not limited .to the particular products or reacting conditions mentioned therein:

was g H, N Parts of the; acid. sodiumflsalt of 4-nitro- 4 aniinorstilbene 2.2f disulfonio acid are ,diazortizedijand combined in the usualmaiiner with parts oflsalicylio alcidt The dyestufi Obeofi. 'Then the dyestufi isdissolvedin 1300 parts 5 35jl3! and at a temperatureof 75 an aqueous solution of 19.5 parts :Of dextrose is added to l the masswhich is maintained for about, 2 hours at this temperature, Finally the reactionflmass a is neutralizediwith hydrochloric acid, the reacg tiohproduct isseparatedby means of common j saltand thenfliiltered oif jqThe dried dyestuflf whichg corresponds;probably to the following forms a brown powder soluble inwater with an orange, in con'centrated sulfuric acid with a violet ,"color, dyeing cotton bright 1 brownish orange shades which aredistinguishe'd'by their fastness to light, By an after-treatment "with copper sulfate the fastness-qualities of these dye! ings, especially to lightQare increased; t The same dyestuff is obtained by treating niacid with a caustic lye and dextrose; tetraz'otizing the diainino a I azoxy-distilbene-tetrasulfonic acid thus obtained In many cases these dyestuffs may be also oband combining it with salicylic acid.

Ez ampZe Z t l 61.5 parts of nitro-a.mino+stilbene -dlsulfonic materials a "8 a parts of causticsodallye o fj fastness to washing acid-azo-salicylic acid are suspended in 450 parts of water and then an aqueous solution of 36 parts of crystallized sodium sufide is added at 35. When the reduction is complete the amino-azo-dyestuff is separated bythe addition of 18 parts of hydrochloric acid of 120 Be, and common salt and after'coolih'g'it'is filtered'ofi.

The dyestuff is redissolved in water and phosgene is introduced into the solution in the presence of alkali until the conversion in the urea-= derivative is complete. Finally the reaction mass is made alkaline by adding sodium carbonate solution, the dyestuffLis precipitated by'the" addition of common salt and' filtered off.

The dried dyestuff forms an orange-brown powder soluble in water with an orange-yellow,

in concentrated sulfuric acid with a wine-red color. It corresponds to thefollowing-- formula oo c and dyes cotton brightyellow shades of 'excellent fastness to light. By after-treating with copper sulfate the fastness to light is increased and moreover an excellent fastness to washing is thus obtained. 7

By using, instead of salicylic acid, or mcresotic acid, dyestuffs of similar properties are obtained.

By treating nitro-amino-stilbeneedisulfonic acid with phosgene in the presence of alkali, reducing the 'dinitro-distilbene-urea-tetrasulfonic acid, tetrazotizing and combining it with salicylic acid, the same dyestuffis obtained;

Example 3 The mono-azo-dyestuff, obtained by diazotizing 42.2 parts of nitro-amino-stilbene-disulfonic acid and coupling with 315 parts of 2-phenyl amino-naphtho1-7-sulfonic acidin. a solution of alkali-bicarbonates, is warmed to. 910, then precipitated by the addition of common salt and filtered off; The paste thus obtained isdissolved in 2000 parts of water and tratedat 80 for about 2 hours with 90 parts of caustic soda lye 07235 B. am 1'7 partsof'dext ros'e. ThesDarated reaction product is filtered off. The dried dyestuff which corresponds probably to thefollowing formula L0 rep-resents a dark powder having a metallic lustre. It dissolves in water and in'concentrated sulfuric acid with a violet color and dyes cotton By using instead of the '2-phenylamino-5- naphthol-l-sulfonic acid the 2-(4'-hydroxy-3- carboxy phenyl amino) -5-naphthol-7-sulfonic acid also a substantive violet dyestuff is obtained. By after-treating the dyeings of this dyestuff with copper-sulfate, violet shades of good fastness to washing are obtained.

Example 4 79.2 parts of the mono-azo-dyestuff, obtained and used according to the foregoing example, are reduced into the amino-azo-dyestufi by means of 36 parts of sodium sulfide. This dyestufi is treated with phosgene in a solution of alkali-bi carbonates until the formation of the urea is finished. Then the reaction mass is made weakly alkaline by adding at 90 a sodium carbonate solution and-filtered off. The dried dyestuff corresponds to the following formula Example 5 53.9 parts of the dyestuff, obtained from diazotized nitro-amino-stilbene-disulfonic acid and phenol, are methylated in the phenolic hydroxylgroup by a suitable alkylating agent, as, for example, alkali and dimethyl-sulfate or methyl chloride. In order to. transform this methylated product into a new substantive azo-dyestuff, 56.3 parts of. the product are dissolved in about 1800 parts of water and at 75 103 parts of caustic soda lye of 35 B. and 21.5 parts of dextrose are added; the mass is maintained at 75-80 for some time.- After cooling down the precipitated dyestuff is filtered ofi by suction. The dried dyestuff which corresponds probably to the following formula SOaH ' i I. r v I SOBH 2 beautiful reddish violet shades of an excellent represents an orange-red powder; it dissolves in water with an orange, in concentrated sulfuric methylated as' described in Example 5; The trisazo-dyestufi thus obtained corresponds to the following formula 1 said dyestufi i'being distinguished. by an excellent aifinityffor vegetable fiber, dyeing cotton bright orange shades fast to light and chlorine.

anddissolves in concentrated sulfuric acid with a blue color. It dyes cotton orange shades which are fast to light.

SOaH

" Example 11 14.5 parts of the reduced dyestufi (obtained by combining the diazo-compound of nitroamino-stilbene-disulfonic. acid with phenol and subsequently methylating) are heated underrefiux for about 20 hours with'16.5 parts of the unreduced dyestulf in 600 parts of normal caustic soda lye. The new dyestulf precipitates gradually. When the condensation is finished it is filtered off, washed by means of hydrochloric acid of 3 B. and dried. 'The dyestuff thus obtained is' practically identical with that obtained according to the foregoing example.

1. The azo-dyestuffs of the general formula wherein X stands for the radical of a coupling component free from azo' groups in which an hydroxy groupmay be alkylated and Y'stands for an azoor azoxy-group, said dyestuffs being distinguished by an excellent aflinity for vegetable fiber. i 1

i 3. The a'zo-dyestuff of the formula v said dyestufi' being distinguishedby an excellent affinity for vegetable fiber dyeing cotton bright brownish orange shades fast to light.

4. The azo-dyes'tuff of the formula.

5. The process which comprises subjecting an azo-dyestuif of the general formula (wherein'X' means the radical of a coupling component which may be alkylatecl) to the action of a feebly acting reducing agent.

6. The process which comprises reducing the azo-dyestuff of the formula HO O C SOaH $6311 with dextrose and alkali.

'7. The process which comprises reducing the azo-dyestuff of the formula mocO-nm-Q-omonGm:

I SOaH 363E with dextrose and alkali.

' 8. The azo dyestuffs of the general formula:

wherein X stands'for the radical of a coupling component free from azo groups of the group consisting of hydroxylated benzene compounds the hydroxyl group of which maybe alkylated, hydroxylated naphthalene compounds and acetoacetic acid arylides and Y stands for a bivalent group containing two nitrogen atoms, said dyestuffs-being distinguished by an excellent affinity for vegetable fiber.

9. The azo dyestuffs of the general formula:

1 s0=n sha wherein X stands for the radical of a coupling component free from azo groups of the group consisting of hydroxylated' benzene compounds I 2,'oo4,25o f5 the hydroxyl group of which may be alkylziteihy- 10. The azo dyestufi'otthe formula:

son: 0.11

droxylated jnabhtholene compounds and Ia cetoi g g i mg f b g V acetic acidarylides and Y stands for anazoor a fi fl g f g fi on mg 10 azoxy-group, said dyestufis being distinguished; orange 8 9 as 1g an 0 prme HANS Y SCHINDHELM. by an exoellent afiimty ifor vogotablo fibor. I RICHARD GAST' j 

